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Home > Products > Integrated Circuits (ICs) > Data Acquisition > Analog to Digital Converters (ADC)

Analog Devices Inc. AD7856ARSZ

Name: AD7856ARSZ
Brand: Analog Devices Inc.
SKU: AD7856ARSZ
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AD7856ARSZ

Manufacturer:: Analog Devices Inc.

Category:: Analog to Digital Converters (ADC)

Package:: 24-SSOP (0.209", 5.30mm Width)

Datasheet:: AD7856ARSZ.pdf

Description:: IC ADC 14BIT SAR 24SSOP

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Product details

Overview

AD7856ARSZ from Analog Devices is a 14-bit, 285 kSPS successive approximation register (SAR) analog-to-digital converter (ADC) operating from a single 5 V supply. It features eight single-ended or four pseudo-differential analog inputs, on-chip reference (4.096 V), self- and system calibration, and SPI/QSPI/μP-compatible serial interface. It targets high-accuracy data acquisition in battery-powered instrumentation and control systems.

For engineers reviewing the AD7856ARSZ datasheet, AD7856ARSZ pinout, AD7856ARSZ application, or AD7856ARSZ equivalent, key selection considerations include its 14-bit resolution with ±2 LSB INL, 78 dB SNR at 10 kHz input, 3.5 µs conversion time (A-grade), flexible power-down modes (2.5 mW typ), and SSOP-24 package compatibility with industrial temperature range (–40°C to +105°C).

Technical Context

The AD7856ARSZ implements a charge redistribution SAR architecture with integrated track-and-hold (500 ns acquisition), internal 4.096 V reference, and programmable channel configuration via 14-bit control register. Its analog front-end supports 0 V to VREF input range and tolerates AIN(+) up to AVDD with AIN(–) biased within AGND–AVDD.

Serial communication uses a 3-wire SPI-compatible interface (SYNC/SCLK/DIN/DOUT) with mode-selectable 2- or 3-wire operation. Calibration logic supports automatic power-up self-calibration, user-initiated full self-cal (41.7 ms), system offset cal (4.63 ms), and gain cal (37.04 ms), all referenced to external or internal REFOUT.

Key Specifications

Parameter	Value and Actual Design Meaning
Resolution	14-bit - delivers 16,384 discrete output levels for high-fidelity signal digitization.
Sampling Rate	285 kSPS (A-grade) - enables real-time capture of signals up to ~10 MHz full-power bandwidth.
INL / DNL	±2 LSB max - ensures monotonicity and <1 LSB error across full scale for precision measurement.
SNR	78 dB min at f_IN = 10 kHz - supports >12.6 effective bits for low-noise sensor or audio front-end use.
Power Consumption	60 mW typ normal mode; 2.5 mW typ auto power-down - extends battery life in portable PDA or medical devices.
Analog Input Range	0 V to V_REF (up to 4.096 V) - simplifies design with rail-to-rail compatible input and no external level-shifting.
Reference	Internal 4.096 V REFOUT with ±20 ppm/°C tempco - provides stable scaling without external reference IC.
Operating Temp	–40°C to +105°C - qualified for industrial and automotive under-hood environments.

Pinout & Package

AD7856ARSZ is housed in a 24-lead SSOP (Shrink Small Outline Package), 0.154-inch body width, gull-wing lead form, RoHS-compliant. Pin pitch is 0.025 inch (0.635 mm). Thermal resistance θ_JA = 115°C/W.

Pin/Terminal	Circuit Role	Design Meaning
1 CONVST	Convert Start input	Edge-triggered command to initiate sampling; falling edge starts track-to-hold transition and conversion sequence.
2 BUSY	Conversion status output	Active-high open-drain signal indicating active conversion or calibration; used for handshaking with host μP.
3 SLEEP	Low-power mode control	Logic-low entry into full or partial power-down; retains calibration data and reference bias during sleep.
4 REFIN/REFOUT	Reference I/O	Provides 4.096 V internal reference; accepts external 1.2 V–5 V reference or connects to AVDD for ratiometric operation.
5 AVDD, 6 AGND	Analog supply & ground	Separate 5 V ±5% analog domain supply and dedicated ground minimize noise coupling into ADC core.
7 CREF1, 8 CREF2	Reference decoupling	External 0.1 µF + 470 nF (CREF1) and 0.01 µF (CREF2) ceramic caps stabilize DAC charge redistribution and reference node.
9–16 AIN1–AIN8	Configurable analog inputs	Support eight single-ended (vs. AGND) or four pseudo-differential pairs; channel selection via control register bits CH2–CH0.
17 CAL	Calibration trigger	Falling edge resets calibration logic; rising edge initiates self- or system calibration; 10 nF cap to DGND enables auto-cal on power-up.
18 DVDD, 19 DGND	Digital supply & ground	Isolated 5 V ±5% digital domain supply and ground reduce switching noise impact on analog performance.
20 DOUT, 21 DIN	Serial data I/O	16-bit MSB-first SPI-compatible interface; DIN functions as bidirectional in Mode 1 (2-wire) or input-only in Mode 2 (3-wire).
22 CLKIN	Master clock input	Accepts 6 MHz (A-grade) or 4 MHz (K-grade) external clock; defines conversion timing (21 cycles per conversion).
23 SCLK, 24 SYNC	Serial interface clocks	SCLK drives data transfer; SYNC frames each 16-bit word-low-active assertion synchronizes read/write operations.

Key Features

Feature	Design Value
Single 5 V supply operation	Eliminates need for dual ±5 V or separate analog/digital rails-reduces BOM count and PCB area in portable designs.
Auto-calibration on power-up	Performs full self-calibration automatically when CAL pin is tied via 10 nF to DGND-ensures accuracy without host intervention.
Pseudo-differential input architecture	Rejects common-mode noise on AIN(+)–AIN(–) pairs while supporting single-ended use-ideal for noisy industrial sensor interfaces.
Flexible serial interface	Hardware-configurable SPI/QSPI/8051/μP compatibility via control register bit 5 (2/3 MODE)-enables reuse across legacy and new microcontroller platforms.
Multiple power-down modes	Three states: normal (60 mW), partial (400 µA), full (30 µA)-allows dynamic power scaling based on sampling duty cycle.
On-chip reference with tempco	4.096 V REFOUT with 20 ppm/°C drift-provides stable scaling over industrial temperature range without external reference IC cost or layout area.

Applications

Portable Medical Instrumentation	Battery-Powered Data Loggers
Use Scenario: Continuous acquisition of ECG, pulse oximetry, or glucose sensor outputs in handheld diagnostic devices. IC Role / Device Role / Timing Role: Primary 14-bit digitizer with built-in reference and low-power sleep modes synchronized to sensor sampling intervals. Use Value: 78 dB SNR and ±2 LSB INL ensure clinical-grade waveform fidelity; 2.5 mW auto power-down extends AA-battery life beyond 100 hours.	Use Scenario: Long-term environmental monitoring (temperature, humidity, pressure) in remote field deployments. IC Role / Device Role / Timing Role: Multi-channel ADC interfacing to resistive and capacitive sensors, triggered by ultra-low-power MCU wake-up events. Use Value: Eight configurable inputs reduce external MUX count; internal calibration maintains accuracy across –40°C to +85°C operating range without recalibration.
Industrial PLC Analog Input Modules	High-Speed Modem Signal Conditioning
Use Scenario: Digitizing 4–20 mA current loop or ±10 V voltage signals in programmable logic controller backplanes. IC Role / Device Role / Timing Role: Precision front-end ADC with pseudo-differential inputs rejecting common-mode noise from motor drives and solenoids. Use Value: –90 dB channel-to-channel isolation prevents crosstalk between adjacent channels; robust ESD protection (>1 kV) withstands factory floor transients.	Use Scenario: Baseband sampling of QAM/OFDM signals in cable or DSL modem receiver paths before DSP processing. IC Role / Device Role / Timing Role: High-throughput 14-bit digitizer capturing full-power 10 MHz bandwidth signals with minimal harmonic distortion. Use Value: –86 dB THD and –87 dB spurious noise meet DOCSIS 3.1 spectral purity requirements; 285 kSPS rate supports 128-QAM symbol rates.

Portable Medical Instrumentation

Battery-Powered Data Loggers

Use Scenario: Continuous acquisition of ECG, pulse oximetry, or glucose sensor outputs in handheld diagnostic devices.

IC Role / Device Role / Timing Role: Primary 14-bit digitizer with built-in reference and low-power sleep modes synchronized to sensor sampling intervals.

Use Value: 78 dB SNR and ±2 LSB INL ensure clinical-grade waveform fidelity; 2.5 mW auto power-down extends AA-battery life beyond 100 hours.

Use Scenario: Long-term environmental monitoring (temperature, humidity, pressure) in remote field deployments.

IC Role / Device Role / Timing Role: Multi-channel ADC interfacing to resistive and capacitive sensors, triggered by ultra-low-power MCU wake-up events.

Use Value: Eight configurable inputs reduce external MUX count; internal calibration maintains accuracy across –40°C to +85°C operating range without recalibration.

Industrial PLC Analog Input Modules

High-Speed Modem Signal Conditioning

Use Scenario: Digitizing 4–20 mA current loop or ±10 V voltage signals in programmable logic controller backplanes.

IC Role / Device Role / Timing Role: Precision front-end ADC with pseudo-differential inputs rejecting common-mode noise from motor drives and solenoids.

Use Value: –90 dB channel-to-channel isolation prevents crosstalk between adjacent channels; robust ESD protection (>1 kV) withstands factory floor transients.

Use Scenario: Baseband sampling of QAM/OFDM signals in cable or DSL modem receiver paths before DSP processing.

IC Role / Device Role / Timing Role: High-throughput 14-bit digitizer capturing full-power 10 MHz bandwidth signals with minimal harmonic distortion.

Use Value: –86 dB THD and –87 dB spurious noise meet DOCSIS 3.1 spectral purity requirements; 285 kSPS rate supports 128-QAM symbol rates.

Equivalent & Alternatives

The following parts are listed as comparable options for similar 14-bit SAR ADC applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
AD7956BRUZ	16-bit, 1 MSPS, 1.8 V/3.3 V supply, no internal reference - requires external REF, higher speed but larger die and power.	Targets higher-resolution, higher-speed applications (e.g., automated test equipment); lacks auto-cal and 5 V compatibility.	Select AD7956BRUZ only if 16-bit resolution and >500 kSPS throughput are mandatory and 5 V operation is not required.
ADS8688IPWR	16-bit, 500 kSPS, integrated 4.096 V reference, SPI interface, 5 V tolerant I/O - wider input range (±10.24 V), no pseudo-differential mode.	Optimized for industrial voltage/current input modules; supports bipolar inputs but lacks AIN(+)–AIN(–) crosstalk rejection.	Choose ADS8688IPWR when bipolar ±10 V inputs dominate and channel isolation is less critical than input flexibility.

Compared with AD7856ARSZ, AD7956BRUZ trades integrated calibration and 5 V simplicity for raw resolution and speed, while ADS8688IPWR sacrifices pseudo-differential architecture for bipolar input support and tighter reference spec-neither offers drop-in replacement capability due to pinout, register map, and feature set differences.

Availability

AD7856ARSZ is available at Aetrix Electronics and suitable for industrial PLC analog input modules, portable medical instrumentation, and battery-powered data loggers requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for AD7856ARSZ includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, founded in 1965 and headquartered in Wilmington, MA.

The AD7856ARSZ belongs to Analog Devices' precision SAR ADC product line, designed specifically for high-accuracy, low-power, multi-channel data acquisition in industrial, medical, and communications equipment where calibration stability and supply simplicity are critical.

FAQ

What is the maximum sampling rate of the AD7856ARSZ?

The AD7856ARSZ achieves a maximum throughput rate of 285 kSPS in its A-grade version (–40°C to +105°C) when operated with a 6 MHz master clock (CLKIN). This corresponds to a 3.5 µs conversion time. The K-grade variant supports 102 kSPS at 4 MHz CLKIN. Both versions maintain full 14-bit performance and specified DC accuracy across their respective temperature ranges. The AD7856ARSZ does not require external oversampling or averaging to achieve its rated speed.

Does the AD7856ARSZ require an external reference voltage?

No, the AD7856ARSZ does not require an external reference voltage. It integrates a precision 4.096 V bandgap reference accessible at the REFIN/REFOUT pin, with typical temperature coefficient of 20 ppm/°C. This internal reference can be overdriven by an external source (1.2 V to VDD) for ratiometric or enhanced accuracy applications. When using the internal reference, external capacitors CREF1 (0.1 µF) and CREF2 (0.01 µF) must be connected to AGND as specified in the datasheet to ensure stable DAC operation and low noise.

How does the AD7856ARSZ handle channel configuration and input types?

The AD7856ARSZ supports eight single-ended inputs (AIN1–AIN8 referenced to AGND) or four pseudo-differential pairs (e.g., AIN1–AIN2, AIN3–AIN4) via software configuration. Channel selection and input mode are controlled by bits SGL/DIFF (bit 13) and CH2–CH0 (bits 12–10) in the 14-bit control register. No hardware changes are needed-the same physical pins serve both configurations. Pseudo-differential mode provides inherent common-mode noise rejection while maintaining single-ended simplicity in routing and sensor interfacing.

What power management options does the AD7856ARSZ offer?

The AD7856ARSZ provides three distinct power states: normal operation (60 mW typ), partial power-down (400 µA typ), and full power-down (30 µA typ). These are selected via the SLEEP pin and PMGT1/PMGT0 bits (bits 9–8) in the control register. Full power-down disables the internal reference and most circuitry while retaining calibration coefficients. Automatic power-down after conversion reduces average power in burst-mode acquisition. All modes retain register contents and require no reinitialization upon wake-up.

Can the AD7856ARSZ perform system-level calibration?

Yes, the AD7856ARSZ supports both self-calibration and system calibration. Self-calibration corrects internal offset and gain errors using on-chip DACs. System calibration allows correction of external errors-including those introduced by front-end amplifiers, filters, or sensor conditioning circuits-by applying known reference voltages to AIN(+) and AIN(–) and storing correction coefficients in on-chip calibration registers. System calibration is initiated via the CAL pin or control register bits CALMD, CALSLT1/CALSLT0, and STCAL, with defined voltage spans (+0.0375 × VREF for offset, ±0.01875 × VREF for gain).

AD7856ARSZ Specifications

Product attributes: Attribute value

Manufacturer:: Analog Devices Inc.

Series:: -

Package/Case:: 24-SSOP (0.209", 5.30mm Width)

Packaging:: Tube

Product Status:: Active

Number of Bits:: 14

Sampling Rate (Per Second):: 285k

Number of Inputs:: 4, 8

Input Type:: Pseudo-Differential, Single Ended

Data Interface:: SPI

Configuration:: MUX-S/H-ADC

Ratio - S/H:ADC:: 1:1

Number of A/D Converters:: 1

Architecture:: SAR

Reference Type:: External, Internal

Voltage - Supply, Analog:: 5V

Voltage - Supply, Digital:: 5V

Features:: -

Operating Temperature:: -40°C ~ 105°C

Supplier Device Package:: 24-SSOP

Mounting Type:: Surface Mount

Grade:: -

Qualification:: -

AD7856ARSZ FAQ

1.How can I place an order for AD7856ARSZ through Aetrix?

Please submit a Request for Quotation (RFQ) for AD7856ARSZ on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for AD7856ARSZ reliable?

The price and inventory of AD7856ARSZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7856ARSZ is usually 5 days.

3.What payment methods are accepted for AD7856ARSZ?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7856ARSZ transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AD7856ARSZ?

AD7856ARSZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AD7856ARSZ order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for AD7856ARSZ?

For technical support, including AD7856ARSZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7856ARSZ requirements.

6.How does Aetrix verify that AD7856ARSZ is sourced from the original manufacturer or authorized distributors?

All AD7856ARSZ products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that AD7856ARSZ meets industry standards.

7.What is the process for return or replacement of AD7856ARSZ?

All AD7856ARSZ units undergo pre-shipment inspection (PSI). If there is an issue with AD7856ARSZ, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The AD7856ARSZ part is unused and in its original packaging.

Return procedure for AD7856ARSZ:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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